Sorry, I guess you can’t DM here so reposting this comment:
"I love Formula 420 also. For anyone interested in this topic, I’ve written a blog post about the Best Bong Cleaners in 2022, feel free to DM me about it!
It’s got links to products and added discount codes to help you save some money. There has been so much development in this space since 2016! I write a lot about bong cleaning and hope to be the definitive authority on the topic. As part of my bong cleaning business
I’ve really cleaned over 10,000 pieces in the past three years <3"
Feel free to contact me on my site or visit my post about cleaning tips with your specific questions about difficult percs or tough stains in your glass!